Chapter 9: 1. Which of the following statements about water is TRUE?

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Presentation transcript:

Chapter 9: 1. Which of the following statements about water is TRUE? a. Water can ionize. b. Water can function as both an acid and a base. c. The concentration of hydronium ion and hydroxide ion in pure water is constant d. All of the above

2. What happens when a strong acid is dissolved in water? a. All of the acidic protons dissociate from the molecule. b. Most of the acidic protons remain tightly bound to the acid because the bond is strong. c. The acidic protons react with the hydroxide ions from the water to form new water molecules, thus increasing the volume of the solution. d. The strong acid is converted into a strong base.

3. If the concentration of hydronium ions is greater than the concentration of hydroxide ions in an aqueous solution, what must be true of the ion-product of water? a. It is lower than 1  10-14. b. It is greater than 1  10-14. c. It remains 1  10-14. d. It becomes 0.

4. If the pH of a solution is 9, what is the concentration of hydronium ions? a. There are no hydronium ions since the solution is basic. b. The amount of hydronium ions is less than the amount of hydroxide ions. c. The amount of hydronium ions is equal to 1  10-14 M. d. The concentration of hydronium ions is equal to 1  109 M.

5. Formic acid, HCOOH, has a pKa of 3.75. Therefore, formic acid would a. be classified as a strong acid b. be classified as a weak acid c. completely dissociate when dissolved in water d. produce more hydroxide ions than hydronium ions when dissolved in water

6. What will be the result if an acid is added to a buffer? a. The pH of the buffer will decrease. b. The acid will react with the conjugate base of the buffer. c. The pH of the buffer will stay the same. d. Both b and c will occur.

7. When an acid-base titration reaches the equivalence point, which of the following statements are NOT true? a. The volume of acid mixed with base is equal. b. The moles of acid are equal to the moles of base. c. The endpoint of the titration has been reached. d. The reaction has gone to completion.